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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72f5f4cabb99696eca71a4340deffd717f81313abeeda40456410c44875aacf' 
  AND token = '8ua/V2abdus252nxqkHiiMkn5Y1bsvXTCHLJ6593Ks0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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