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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98478c22ecde902a9ed4b82b6011c6fd5df6ae03aa48cf0ddb7ba1bc6a213049' 
  AND token = 'YO0ijfYZ4s1/SQKjuWoB8SzemmF3uGG3ilg08xHBauc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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