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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '757d0c1ae6b367dd2782f9fb106eaa5a05b921ba829d1fa10aeb8df882098e26' 
  AND token = 'L035fjIs00dz6PaumnZyNp0QqrUaenkdMe1fJmLWc/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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