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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb2478b3afdd1631d5ff96f7389c9054910de59b612ad2f49fbdfe6f54cff95' 
  AND token = 'hTwIoyZKlS3uyUArO85EA/tDWb7Oct6ZkjkZSw+nQTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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