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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570f1793b1e71fb4d59b76ddba85837c15d3821d52c199d4dfecf3e30b523815' 
  AND token = 'qDk33gLu+N+1rwlLrj2tXF8yzgdcfqc9VBE0jUhBEf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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