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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e123e27cd2df83b1e4784d49e7f451a53dfbd2f2d8937d3dad224d0b392dd0' 
  AND token = 'fb0bjhJXiDWr7/8YFLsKWVIPSYf15jcN71176XwrDgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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