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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f65f491883cbd92d25ceda9e42e91507890c0836b252aaeea017d6ccc90e9ec' 
  AND token = '62csCrJSU6xKBieW6rlky6nqUraaZwQz9uk3Nm/ko3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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