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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acebb8533b578b2e01ef6e527db4c58bd9be322beaee6513cc94b5ceee41d6f0' 
  AND token = '1kZ2bqjfXd2jWb9a6Vvjd2/EWk+PHchfwcXOabc/T+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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