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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bb91d6d485d4ae34f9b9a2293e0872d6d59128eecf2315da93cb51e98ab001' 
  AND token = 'DgsSz+7dl8Csbdokj477/QcO5dTr7ADZZPUy/tyX4s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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