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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3e3830d3462d88df9cb8051bdd9e312f17c7a829221355996d217e11544849' 
  AND token = '9PoUjK4quy4nWUD0elc3VL2B52J7y33/Le0HoOOU1TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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