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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb071c17fbce6ffade8efab036f0bae69bb52946f6f2a514a5061c2ec1c9ca78' 
  AND token = 'kWfF2vEG9gsHtsk2SJzN//DXGVQ4X0kibyzD58T5f60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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