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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b207f21df138c84e7a663c2a97ee86cf8732ebf2f5ab1005cdba5a5011aa5cd3' 
  AND token = 'DYJpscOxt01kMsKPrNf3wtq51+qdmmrielSm1RrximE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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