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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe3c43c18e936563d5e8b8842fd0bbc7527c06295487f976e943f463b0d689a' 
  AND token = '/oscD5/COXqK0fpyePbV16wNcEMwE5SYUmKFO54Q68E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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