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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04aa690a849e3c5b96d2796ae96c0f5ff284ddd22dd187493485cd2535c2b04' 
  AND token = 'x2z1EeJLpuf5PGHkSwwvm6BI1wnH48AbeF7s26vcTRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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