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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d01320850012276a92b3f86d4f41f6a0d89ee97205ddf7674f4767236b0fab8' 
  AND token = 'YxgXOJ5311fdEFdCQSL1AZYWGlxZ9V0X24DJI3Q8EMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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