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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd774aad139cc60b5e2811e6808e23c7504124f77226790827bf0788b4c26d6e' 
  AND token = 'S7PT1wWS03su6SD8Wg1LOHoNotviUNgwdJgf0NhyiFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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