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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade24bf1e60833467c56fe5843756fa785e1b3c8e6454bae480dd6af005d94b0' 
  AND token = 'YwKz+aWWbNHB+HKLRfgdDDWsbsLUE7te9DMRb7mAjVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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