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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82be66454fd1e5969552f35795871b14cf6586badd964f71aaa962e2e6158c31' 
  AND token = 'x0Q6YSd5uMZO2GOys1bn+BOw8/2zrvrfbG9ErKfi/oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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