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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff501a4a69df4bf3a3064071edc5914b4e54d4b8adf0d945b36f38b719cc428f' 
  AND token = 'suH/k0Y30JNOR1tNApTTSSNio5+0W9S3HysAncfFv9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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