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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9f4d28403af542bbfa717226121def72a193b6821177b9b30304fb9d2057b6' 
  AND token = 'I7iD9k8CUa26aNi9NMBjfHrwERHXuXCGRWPI5wtEPOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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