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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8083248f1f66744cad55e3298670ef48d629c206e6a3dfa758cbd792421b8770' 
  AND token = 'RxAeeqU0YGGsU9QAloGVf8P1bu3EXAIp2D7ddjt3Fvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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