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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4840868fc930a92db192e8cf0c900bb7a0c19d2ab3ceb65524925781961d7b90' 
  AND token = 'voSWOAQHkS4ZJd5MJ6EYsDq6dHHC3VySPInArK0aO2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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