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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986be74abbaf53fbf789d68e7aa8977ea393a6c46b575eab21df872cd332665e' 
  AND token = '48X+u+5JOMRlehoe6HKn1MIKpgZIjH976fEg+0FJjmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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