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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ce507296e3ed64d7c5eeb96a226834ede957e521b53ba7f8bb79136246a2c2' 
  AND token = 'ky4fiUZsmn/aG/i3IAy5k6xh+x1SMbyzGageSRRzl8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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