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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0526f5eaf7e3b503ad17c95f9f0eec02d1d37c69c94772e1459d547a853c81cd' 
  AND token = 'HIGwtm8GLJfKR1Gtwxa6Uh1F6Ssbita/v9vpusWk3YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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