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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a594e53ed178fa52b0476e7f4cd6a726e71a1de1319a2e540fb45b7168d7d5' 
  AND token = 'RA4R7KU9egifxd099TSHRS80TIrnJhBmdW2kPc+X9y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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