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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002e0bb99e4fd416ce63e26abea96ebf16e32c8f71d12cbf2d43d85136a3152a' 
  AND token = 'Q3Sdc4wt4DOE6cq98w0oHhNc7X3TjAVMs3HUT5p4rKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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