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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95cb7c4ab20bc6d93ba943791d0c1184c60d732381ff4dd6a5da6f5e9cbec3d0' 
  AND token = 'YnRbQcixCXMHMb1433YoREUso0qbCHDqc3VspU9MzLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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