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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc837a13afe43c5bf6e6babc1b5acc9250b29600ded23f2adee40677b3e48b2' 
  AND token = 'j4o0oOpxl18952713cvqr2vNh5LC+Qvko/aq5I5BZQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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