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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f869b32386951300cea82db97898195a7649e3a7700c0267651ffc047b6ccf6' 
  AND token = 'H2X6Gno8EFJzYChp1QbOjz4gB7xvOc5TI4o96tDhaGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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