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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c90a19b81b7305d90ea9c66260694fc380a9c84080d227d4ef02e48d5c6773a' 
  AND token = 'nfXNqPyhTYjCvydjB3BOp2o8g3oEglLsNmNNqy4UKA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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