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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebfdf5f101b4ee5a6fdda2851d1cee2e8faba2091e2863307938c16686719a55' 
  AND token = 'tQuTR46dyJM3q2hzThYNrq6bdNG+hjuaX+jJRfQpHKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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