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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab595141a92618e8d799265835adf51f2a0b68b6bb043ef30f16a76a2203b155' 
  AND token = 'Csr3LSm1TxH+tLzfz9jitkP2FnRdlVsMqwio/TyqwQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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