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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c47cf987861701f06a92eda2f383304d9d93c162d4c53295a88e0b4fd4bab1' 
  AND token = 'NbPQMe9eVn4aKGe/NwNKuUxJdKwZrHr26b6mgIy47Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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