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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c14d9dd8867841f85e36b577e337b85fa9953b26d5374b5eb69ca604dcb0c0a' 
  AND token = 'XV3flih7nTum83wr3akjo7q0gMIEwkOetx58QJ2LW8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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