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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bdf55ca5563ffdda0f26455f8b241e0415fc03f3569acef35572173733ec182' 
  AND token = 'OHoE8oQ7ERwHrwAYRpUYQTU7tA+4z/5a9UO0eQ+OcZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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