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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41fd977d2716254ca3189d5ce9ad57bd5ece1d96924c2a750724829a6d74ca6a' 
  AND token = 'IvW7cUxze+ufHvODSxon4VfRF0HwdjVYrBxh0r1CBOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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