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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f18c21d5f36593e56c610de01eebe75738a8a50d4f3c1ca7c2b6d669ccd690' 
  AND token = 'PLSBdLU46d631Hx85fc7IKJfQ6R5WRowkaj1vJQDyx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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