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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c355601e7315b9ac9e5d27d2c342c699fbcf9c1ae529edac12a0ac463b03032a' 
  AND token = 'M9KE75dw7T0o8TwQKIPwTD0bbMQjaLjOiAK0X0xbHQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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