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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39dc7e56c14b27a63667a30437a7ea8a255064fad5e6abd0c8b323fbab6b30fa' 
  AND token = '82IDI1fJF/XWXCiA+s3nMR0mUb44wo8TIigPGwEUjjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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