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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94cc22013ba397fc4b20b7039ffbdc9777e013707c713e2f4f1358270119812' 
  AND token = 'LGd/Qry5w+bzwJk1O16gy0SbNdJ/rubmqBoRVGm3TlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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