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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c2d5fb1e30e7967351b2126332025a82f4ae0153bda392106182853c577276' 
  AND token = 'OL90SAdi7qp4tElfPyF6ut6QtOxDNqu5CQaiu+KQPFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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