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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3861b478aed713937eb3a26ae57d3c6d599b980bd5be6ffe9c313747f81fb73' 
  AND token = 'HZh94Ic5z2xMg8ilykxheCO2aqlKlm6aGyPhc3IGfRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}