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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb49192027941bc8c5de6627af0867413789dcc787d47340acfe4f21e60980a' 
  AND token = 'Cfigx+Y6qEbAuVuLvN9d4tNoz2t5ixQU0PK/QTTio4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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