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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a56e84e212096c0c0c92dd16d898ede44cc2a79d3b9589f6cb5d787b7cf8ddb' 
  AND token = 'VgXH0HeQBxsbWfr4PeudryOplrg3L0mayDqC6W0UBt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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