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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d8849e53815bf811052d187556429e138f51e7b11e2f84f81103770c7596ce' 
  AND token = 'MY8f71V4N683pKoBP8qtZ8QiVal7I3q4rjDRRBsmimw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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