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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deefa9600cf12d51569a80498c226bbc7141ccb9cd3855d0bd3f94c5390c1f9b' 
  AND token = 'jdT8LC4YhseO37DU9BxmDgmLxf77VtsC58MtpO98Lms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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